铂热电阻原理及应用

铂热电阻原理及技术应用铂热电阻是利用铂丝的电阻值随着温度的变化而变化这一基本原理设计和制作的，按 0°C时的电阻值R（°C）的大小分为10欧姆（分度号为Pt 10）和100欧姆（分度号为Pt 100） 等，测温范围均为200850.10欧姆铂热电阻的感温原件是用较粗的铂丝绕制而成，耐温 性能明显优于100欧姆的铂热电阻，只要用于650C以上的温区：100欧姆铂热电阻主要用 于650C以下的温区，虽也可用于650C以上温区，但在650C以上温区不允许有A级误差。 100欧姆铂热电阻的的分辨率比10欧姆铂热电阻的分辨率大10倍，对二次仪表的要求相应 低一个数量级，因此在650C以下温区测温应尽量选用100欧姆铂热电阻。感温元件骨架的材质也是决定铂热电阻使用温区的主要因素，常见的感温元件有陶瓷元 件，玻璃元件，云母元件，它们是由铂丝分别绕在陶瓷骨架，玻璃骨架，云母骨架上再经过 复杂的工艺加工而成。由于骨架材料本身的性能不同，陶瓷元件适用于850C以下温区，玻 璃元件适用于550C以下温区。近年来市场上出现了大量的厚膜和薄膜铂热电阻感温元件， 厚膜铂热电阻元件是用铂浆料印刷在玻璃或陶瓷底板上，薄膜铂热电阻元件是用铂浆料溅射 在玻璃或陶瓷底板上，再经光刻加工而成，这种感温元件仅适用于-70500C温区，但这种 感温元件用料省，可机械化大批量生产，效率高，价格便宜。就结构而言，铂热电阻还可以分为工业铂热电阻和铠装铂热电阻。工业铂热电阻也叫装 配铂热电阻，即是将铂热电阻感温元件焊上引线组装在一端封闭的金属管或陶瓷管内，再安 装上接线盒而成；铠装铂热电阻是将铂热电阻元件，过渡引线，绝缘粉组装在不锈钢管内再 经模具拉实的整体，具有坚实，抗震，可绕，线径小，使用安装方便等优点！功能简介铂热电阻是一种精确、灵敏、性能稳定的温度传感器。铂热电阻元件配上金属保护管 和安装固定装置（如各种螺纹接头、法兰盘等），就构成装配式铂热电阻。特点WZP系列铂热电阻按我国标准ZBY301-85 （等效国际电工委员会IEC751-1983标准）进 行生产。由于该系列产品具有结构小，使用范围广可靠性好热响应时间短等优点，可形成多 品种、多规格的系列产品，为石油、化工、电站、冶金、轻工、食品、纺织、医疗卫生、国 防工业、科、农业以及机械行业提供新一代优质产品。铂热电阻元件的工作原理是在温度作用下，铂电阻丝的电阻值随之变化而变化的原理。 可用于测量-200800C范围内的温度。其优点是：电气性能稳定，温度和电阻关系近于线 性精度高。主要技术参数产品执行标准IEC751 JB/T8623-1997JB/T8622-1997常温绝缘电阻热电阻在环境温度为15s35°C，相对湿度不大于80%，试验电压为10S100V （直流） 电极与外套管之间的绝缘电阻2100MQ。测量范围及温差型号分度号测量范围。C精度等级允差WZPPT100-200s+500A级土(0.15+0.002t|)B级土 (0.30+0.005t|)WZCCU50 CU100-5Os+ioo土 (0.30+0.006t|)注：|t|为感温元件的实测温度绝对值温度C0123456789电阻值（Q）-20018. 52-19022.8322.4021.9721.5421.1120.6820.2519.8219.3818. 95-18027.1026.6726.2425.8225.3924.9724.5424.1123.6823.25-17031.3430.9130.4930.0729.6429.2228.8028. 3727.9527.52-16035.5435.1234.7034.2833.8633.4433.0232.6032.1831.76-15039.7239.3138.8938. 4738. 0537.6437.2236.8036.3835.96-14043.8843.4643.0542.6342.2241.8041.3940.9740.5640.14-13048. 0047.5947.1846.7746.3645.9445.5345.1244.7044.29-12052.1151.7051.2950.8850.4750.0649.6549.2448. 8348. 42-11056.1955.7955.3854.9754.5654.1553.7553.3452.9352.52-10060.2659.8559.4459.0458. 6358.2357.8257.4157.0156.60-9064.3063.9063.4963.0962.6862.2861.8861.4761.0760.66-8068. 3367.9267.5267.1266.7266.3165.9165.5165.1164.70-7072.3371.9371.5371.1370.7370.3369.9369.5369.1368. 73-6076.3375.9375.5375.1374.7374.3373.9373.5373.1372.73-5080.3179.9179.5179.1178. 7278. 3277.9277.5277.1276.73-4084.2783.8783.4883.0882.6982.2981.8981.5081.1080.70-3088. 2287.8387.4387.0486.6486.2585.8585.4685.0684.67-2092.1691.7791.3790.9890.5990.1989.8089.4089.0188. 62-1096.0995.6995.3094.9194.5294.1293.7393.3492.9592.550100.0099.6199.2298. 8398.4498.0497.6597.2696.8796.480100.00100.39100.78101.17101.56101.95102.34102.73103.12103.5110103.90104.29104.68105.07105.46105.85106.24106.63107.02107.4020107.79108.18108.57108.96109.35109.73110.12110.51110.90111.2930111.67112.06112.45112.83113.22113.61114.00114.38114.77115.1540115.54115.93116.31116.70117.08117.47117.86118.24118.63119.0150119.40119.78120.17120.55120.94121.32121.71122.09122.47122.8660123.24123.63124.01124.39124.78125.16125.54125.93126.31126.6970127.08127.46127.84128.22128.61128.99129.37129.75130.13130.5280130.90131.28131.66132.04132.42132.80133.18133.57133.95134.3390134.71135.09135.47135.85136.23136.61136.99137.37137.75138.13100138.51138.88139.26139.64140.02140.40140.78141.16141.54141.91110142.29142.67143.05143.43143.80144.18144.56144.94145.31145.69120146.07146.44146.82147.20147.57147.95148.33148. 70149.08149.46130149.83150.21150.58150.96151.33151.71152.08152.46152.83153.21140153.58153.96154.33154.71155.08155.46155.83156.20156.58156.95150157.33157.70158.07158.45158.82159.19159.56159.94160.31160.68160161.05161.43161.80162.17162.54162.91163.29163.66164.03164.40170164.77165.14165.51165.89166.26166.63167.00167.37167.74168.11180168.48168.85169.22169.59169.96170.33170.70171.07171.43171.80190172.17172.54172.91173.28173.65174.02174.38174.75175.12175.49200175.86176.22176.59176.96177.33177.69178.06178. 43178.79179.16210179.53179.89180.26180.63180.99181.36181.72182.09182.46182.82220183.19183.55183.92184.28184.65185.01185.38185.74186.11186.47230186.84187.20187.56187.93188.29188.66189.02189